实时荧光定量PCR检测结直肠癌患者粪便肿瘤型M2-PK DNA及临床应用研究

目的建立适用于结直肠癌患者粪便标本肿瘤型M2丙酮酸激酶(M2-PK)DNA检测的实时荧光定量聚合酶链反应(PCR)方法,分析自建方法的临床应用价值。方法采用PCR方法扩增肿瘤型M2-PK DNA片段(162bp),纯化后采用TA克隆法转入PGM-T载体,构建重组质粒。以重组质粒为模板,建立实时荧光定量PCR检测方法,评价自建方法的敏感性、特异性和重复性。选择2014年1月至2016年6月确诊的结直肠癌患者200例,同期体检健康者100例,采用自建方法对受试者粪便和血清标本进行肿瘤型M2-PK DNA检测,并与酶联免疫吸附法肿瘤型M2-PK检测结果进行比较。结果测序结果证实重组质粒构建成功。自建方法检测肿瘤型M2-PK DNA的灵敏度为10copy/mL,对肌肉型M2-PK DNA和M1型丙酮酸激酶(M1-PK)DNA检测结果为阴性,批内及批间变异系数为0.3%~2.9%。实时荧光定量PCR检测患者粪便标本肿瘤型M2-PK DNA阳性率为92.50%,ELISA检测肿瘤型M2-PK阳性率为80.00%。粪便和血清标本肿瘤型M2-PK DNA实时荧光定量法检测结果与肿瘤病理分期密切相关。结论本研究建立的实时荧光定量PCR法适用于结直肠癌患者粪便标本肿瘤型M2-PK DNA检测,具有特异性强、灵敏度高的特点,可用于结直肠癌早期诊断。

Clinical application of real-time fluorescence quantitative PCR for the detection of fecal tumor M2-pyruvate kinase in colorectal cancer patients

Objective To investigate the application valve of real-time fluorescence quantitative polymerase chain reaction(RT-PCR) for the detection of tumor M2-pyruvate kinase(tM2-PK) DNA in patients with colorectal cancer(CRC).Methods Fragment of tM2-PK DNA(162 bp) was amplified and inserted into PGM-T vector to construct recombinant plasmid,which was used to develop RT-PCR method.Sensitivity,specificity and repeatability of RT-PCR for the detection of tM2-PK were analyzed.From Jan.2014 to Jun.2016,200 CRC patients and 100 healthy subjects were enrolled and detected for fecal and serum tM2-PK DNA by using RT-PCR,and the detected results were compared with those detected by using enzyme linked immunosorbent assay(ELISA).Results Recombinant plasmid was successfully constructed,which was certified by sequencing.The sensitivity of RT-PCR for the detection of tM2-PK DNA was 10 copy/mL,with high specificity and 0.3%-2.9% of coefficient of variation.In patients,the positive rate of fecal tM2-PK DNA,detected by RT-PCR,was 92.50%,and that of ELISA to detect tM2-PK was 80.00%.Fecal and serum levels of tM2-PK were correlated with the pathologic stages of tumour.Conclusion Self-established RT-PCR could be specificity and sensitivity for the detection of fecal tM2-PK,which could be used for the early diagnosis of CRC.